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Basic Operation
Switching the power on/off
To turn the mobile power ON press and hold the RIGHT VOL/SQL knob for 1/2 second.
To turn the mobile power OFF press and hold the RIGHT VOL/SQL knob for 1/2 second again.
Adjusting the volume
Turn the outer VOL control clockwise to increase the receiver speaker audio level and counter clockwise to decrease it.
Note:
1. Volume can be adjusted more accurately during communication.
2. The audio volume level is set independently by the LEFT and RIGHT VOL control.
Adjusting the squelch level
Turn the inner SQL control clockwise to increase the receiver background noise and counter clockwise to decrease it.
Note:
The squelch level is also set independently by the LEFT and RIGHT SQL control.
Selecting the operating band
In the factory default configuration, the TH-7800 operates in the "Dual Receive" mode.
During Dual Receive operation, the "Main" band frequency (on which transmission is possible) will be indicated by the
" " icon.
Short press the microphone's [P1] key or press the DIAL knob for the "left" or "right" side, the " " icon will light up alt-
ernative sides of the display as you switch "Main" bands from the "left" side to the "right" side, and vice-versa.
Note:
Short press the LEFT VOL/SQL knob to switch the single receive mode ON and OFF. When it is set ON, the working vol-
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tage will be shown on the "sub" band, the " " icon will appear on the display, and LEFT [LOW], [V/M], [HM], [SCN],
RIGHT [MHz], [RPT], [TONE] keys will be valid for the operating band.
Selecting the frequency band
Press and hold in LEFT DIAL knob for 1/2 second to toggle the operating band on the "left" band.
144 MHz -> 350 MHz -> 430 MHz..
Press and hold in RIGHT DIAL knob for 1/2 second to toggle the operating band between 144 MHz and 430 MHz on the
right side.
Note:
TH-7800 can operate either in a V+V or U+V working mode, if needed.
VHF-VHF (V-V) Operation UHF-UHF (U-U) Operation
Selecting desired frequency
1. Turning Dial
Under VFO mode, rotating the DIAL knob allows tuning in the pre-programmed steps established for the current operating
band. Clockwise rotation will increase the operating frequency while counter-clockwise rotation will lower it.
On the Main band frequency, short press the DIAL knob then rotate it, to change the Main band frequency steps to 1
MHz step. This feature is useful for making rapid frequency excursions over the wide tuning range of the TH-7800.
2. Directly Frequency Entry by the Microphone s keypad
The keypad of the DTMF microphone may be used for directly entry of the Main band operating frequency.
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